Calipers or gage.



'PATENTBD NOV. 24, 1903.

W. REILLY.

CALIPERS 0R GAGE.

APPLICATION FILED SEPT. 17, 1903.

H0 MODEL.

mpmoams PETERS c0, PnoYo-LITHQ. wumuorzm, D. c,

i No. 744,796.

Patented November 24, 1903.

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WILLIAM REILLY, OF \VALTHAM, MASSACHUSETTS.

CALIPERS OR GAGE.

SPECIFICATION forming part of Letters Patent No. 744,796, dated November 24, 1903. Application filed September 17,1903. Serial No. 173,516. (No model) To all. whom it may concern:

Be it known that 1, WILLIAM REILLY, of

WValtham, in the county of Middlesex and a caliper or gage adapted particularl for measuring the parts of violin-bodies, and

therefore termed b me a violin-cali er al- 7 though the invention is not limited to such use and may be used for other purposes.

The invention consists in the improvements which I will now proceed to describe and claim.

Of the accompanying drawings, forming a part of this specification, Figure 1 represents aside elevation of my improved caliper. Fig. 2 represents an end elevation of the same.

The same reference characters indicate the same parts in both the figures.

I11 carrying out my invention I provide a substantially U-shaped stock or body comprising the central portion 3, which is provided with a shank 4 for the attachment of a handle 5, a lower arm 6 on which is formed the fixed caliper-jaw 7, and an upper arm 8, the outer portion of which is offset from the plane of the fixed jaw 7 and constitutes a guide fora movable jaw 0. The movable jaw is adapted to slide on the offset portion of the arm 8 and is arranged sothat it is in the same plane with the jaw 7 as indicated in Fig. 2. The movable jaw 9 is provided with rack-teeth 10,which engage a gear-segment 12, formed on the hub of a pointer 13, which is pivoted at 14 to the arm 8. The jaw 9 is prevented from moving edgewise in one direction by the gear-segment 12 and in the opposite direction by cars 15 15, which are formed on the arm 8 and on an extension 16 thereof, said ears being bent to extend across the outer edge of the jaw 9 and to overlap one side of the same. The jaw 9 and pointer 13 are normally held in their initial positions, as shown in Fig. 1, by means of a spring 17. The central portion of the said spring is coiled upon the pivot 14, and one end of the spring is engaged at 18 with the arm 8, while the opposite end of the spring is engaged at 19 with the pointer 13. The spring therefore acts to force the pointer toward the left, as viewed in Fig. 1, and acts through the gearsegment 16 on the jaw 9, holding the latter against the fixed jaw 7.

20 represents a lever which is pivoted at 21 to the arm 8. One arm of the lever 21 is bent laterally and backwardly to form a tooth 22, engaging a notch 23 in the movable jaw 9, so that when the handle end of the lever is depressed the tooth 22 will be raised and with it the jaw 9. It will be seen that any rectilinear movement of the jaw 9 causes a swinging movement of the pointer 13, the latter cooperating with a segmental graduated scale 24. Said scale extends between the outer end of the extension 16 and the central portion of the arm 8. I 26representsanadjustablestop-screwwhich limits the upward movement of the handle end of the lever 20. Said screw is engaged with an ear 27, which is formed on the arm 8 and is bent laterally from the upper edge of said arm and downwardly at one side thereof, so that it extends across the upper edge of the lever 20 and projects downwardly at one side of said lever, forming a guide or keeper for the lever.

It will be seen from the foregoing that a depression of the handle end of the lever 20 will separate the movable jaw 9 from the fixed jaw 7 and will cause a corresponding movement of the pointer 13. When the work is inserted in the opening thus formed between the jaws and the lever is released, the spring forces the movable jaw against the work and the pointer cooperates with the scale 24 in indicating the thickness of the work.

The stock or body, including the arms 6 and 8, the fixed jaw 7, the extension 16, the scale 24, the cars 15 15, and the ear 27, are all preferably made from a single piece of metal in fiat form, the arm 8 being subsequently slightly bent to one side to ofiset the outer portion constituting the guide for the fixed jaw, while the ears 15 15 and 27 are bent, as shown in the drawings.

It will be seen that the stop-screw 26 can be adjusted to hold the movable jaw at any desired distance from the fixed jaw, the movable jaw being held at any desired adjustment relatively to the fixed jaw.

The guide-arm 8 is provided with a stop 30,

arranged to limit the downward movement of the lever 20 and therefore of the movable jaw. Said stop prevents the movable jaw from overlapping the fixed jaw in case the stock is sprung to throw one jaw out of the plane of the other.

I claim 1. A caliper or gage comprising a stock or body having a fixed jaw at one side of a workreceiving space, a guide at the opposite side of said space, and a graduated scale adjacent to the guide, a jaw movable on said guide and provided with a rack, a lever pivoted to the stock and engaged with the movable jaw, a pointer pivoted to the stock and having a gearsegment engaging said rack, and a spring which holds the pointer and movable jaw in their initial positions.

2. A caliper or gage comprising a stock or body having a fixed jaw at one side of a workreceiving space, a guide at the opposite side of said space, and a graduated scale adjacent to the guide, a jaw movable on said guide and provided with a rack, a lever pivoted to the stock and engaged with the movable jaw, a pointer pivoted to the stock and having a gearsegment engaging said rack, a spring which holds the pointer and movable jaw in their initial positions, and an adjustable stop-screw to determine the initial positions of the lever, movable jaw, and pointer.

3. A caliper or gage comprisinga U -shaped stock or body, one arm of which has a fixed jaw, while the other arm has a guide which is offset from the plane of the fixed jaw, and

a graduated scale adjacent to said guide, a jaw movable on said guide and provided with a rack, a pointer pivoted to the guide-arm of the stock and having agear-segment engaging said rack, a spring whichholds the pointerand movable jaw in their initial positions, and alever pivoted to the guide-arm and having a tooth engaging a recess in the movable jaw, the said guide-arm having ears formed to cooperate with the gear-segment in confining and guiding the movable jaw, and an ad is offset from the plane of the fixed jaw, and

a graduated scale adjacent to said guide, a jaw movable on said guide and provided with a rack, a pointer pivoted to the guide-arm of the stock and having a gear-segment engag in g said. rack, a spring which holds the pointer and movable jaw in their initial positions, and a lever pivoted to the guide-arm and having a tooth engaging a recess in the movable jaw, the said guide-arm having ears formed to cooperate with the gear-segment in confining and guiding the movable jaw, and a stop to limit theinward movement of the movable 5. A caliper or gage comprisinga U shaped stock or body, one arm of which has a fixed jaw, while the other arm has a guide which is offset from the plane of the fixed jaw, and a graduated scale adjacent to said guide, a jaw movable on said guide and provided with a rack, a pointer pivoted to the guide-arm of the stock and having agear-segment engaging said rack, a spring which holds the pointer and movable jaw in theirinitial positions, and a lever pivoted to the guide-arm and having a tooth engaging a recess in the movable jaw, the said guide-arm having ears formed to cooperate with the gear-segment in confining and guiding the movable jaw, and an ear formed to guide and confine the lever, said ear having an adjustable stop-screw arranged to cooperate as described with the lever.

In testimony whereof I have affixed my signature in presence of two witnesses.

WILLIAM REILLY.

WVitnesses:

O. F. BROWN, E. BATCHELDER. 

